Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of high- and low-spin nickel(II) complexes containing the macrocyclic ligand tetrabenzo[b,f,j,n,][1,5,9,13]tetraazacyclohexadecineStuart W. Hawkinson and Everly B. FleischerCite this: Inorg. Chem. 1969, 8, 11, 2402–2410Publication Date (Print):November 1,…
The standard method of determining the index homogeneity of optical-quality glass windows has been extended to improve the accuracy of the results, and to enable disks of over 20 in. (50 cm) in diameter to be evaluated with comparative ease. The evaluation of a 34 in. (85 cm) diameter disk of fused silica illustrates…
Measurements of the thermal conductivity and Righi-Leduc coefficient of Cd 3 As 2 have been made in a transverse magnetic field of up to about 2 T, at temperatures between 68 °K and 300 °K. For one sample the measurements have been extended down to 8 °K. The measurements have allowed the separation of the lattice and…
The site symmetry of Nd3+ in single-crystal [(C6H5)3PH]3NdCl6 is predicted by considerations of molar absorptivity, vibronic spectra, and stoichiometry. A calculation of the crystalline-field splitting of 4f3 J levels appears to predict a sixfold octahedral site symmetry with a slight distortion along one of the axes,…
A general theory of optical-aberration tests, encompassing many well-known practical tests, is presented, utilizing the formalism of spatial filtering, employing coherent illumination. The basic diffraction integrals of the Ronchi-grating test, Foucault knife-edge test, phase Foucault knife-edge test, and the Zernike…
Spin echoes and their external magnetic field effects have been observed on Heusler alloys, Cu 2 MnAl, Cu 2 MnIn and Cu 2 MnSn at 4.2°K. The sign of the internal magnetic field at nuclei of the constituent elements has been determined to be negative, and on the basis of the R-K-K-Y interaction semiquantitative agreeme…
Cr 7 Te 8 exhibits two types of crystal structure according to the difference of thermal treatment; one is the ordered and the other is the disordered arrangements of the vacancies among the successive Cr layers. The saturation moments and the magnetic susceptibilities of both structures are measured in the temperatur…
Une analyse générale de la topologie des dislocations dans les corps mésomorphes conduit à distinguer des "disinclinaisons" parfaites dont la rotation est parallèle ou perpendiculaire à l'axe hélicoïdal d'un cholestérique. L'appariement de deux disinclinaisons du second type, de signes opposés, donne un mode de dissoc…
Infrared spectra of pyridine-H5 and pyridine-D5 in the solid state were measured between 4000 and 200 cm− 1. Frequencies and polarization of fundamental absorptions were established for oriented thin films of freshly crystallized samples. Behavior of the bands in polarized light aided in clarifying several assignments…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text P. F. Mullney and P. N. Dean, "Cell Sizing: a Small-Angle Light-Scattering Method for Sizing Particles of Low Relative Refractive Index," Appl. Opt. 8,…
Abstract The changes occurring when polythene melts are subjected to shear, have been investigated using a rotating bob fitted into a ram extruder. In addition to chain scission, low density polythene exhibits reversible changes in mechanical and viscoelastic properties. The magnitude of the changes is controlled by t…
The enzymic activity of acetylcholinesterase can be photoregulated through the mediation of photochromic inhibitors of the enzyme. N-p-phenylazophenyl-N-phenylcarbamyl fluoride, an irreversible inhibitor of acetylcholinesterase, exists as two geometric isomers which are interconvertible through the action of light. Th…
Abstract A useful concept in polymer science is the degree of crystallinity—the fraction of the polymer that exists in a relatively ordered state. Methods of determination of the degree of crystallinity using density, infrared, thermal, N.M.R. and X ‐ray measurements are examined in light of modern notions of the stru…
The formula proposed recently by Vuks for the polarization field associated with strongly anisotropic organic molecules has been applied to evaluate the orientational order in p-azoxyanisole, p-azoxyphenetole and their mixtures in the nematic phase. It is found to yield accurate results as is confirmed by the internal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination of palladium by azo and related functional groupsAlan L. Balch and D. PetridisCite this: Inorg. Chem. 1969, 8, 11, 2247–2252Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://pubs.acs.o…
Abstract Some properties of multilayered films are summarized in relation to the properties of the component materials. Polymers may be selected for co‐extrusion into layered films to obtain various combinations of properties, such as barrier, stiffness, heat sealability, optics, and toughness. Properly chosen combina…
Abstract β-Hydroxydecanoyl thioester dehydrase from E. coli has been shown to have a molecular weight of 36,000 by ultracentrifugation, gel filtration, and amino acid composition. Electrophoretic behavior, however, suggests that the protein molecule is composed of two equal, if not identical, polypeptide chains of mol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra and bonding in the sodium superoxide and sodium peroxide moleculesLester AndrewsCite this: J. Phys. Chem. 1969, 73, 11, 3922–3928Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of crystal growth of dicalcium phosphate dihydrateRobert W. Marshall and George H. NancollasCite this: J. Phys. Chem. 1969, 73, 11, 3838–3844Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https…
According to Doyle, the thermogravimetric curve of a decomposition reaction can be expressed by the equation log g(α)–log p(x) = B. The variable x depends on the temperature Tα, at which the fraction of the initial compound decomposed is α. Both g(α) and p(x) depend on temperature; however, B is independent of tempera…